<template>
  <div class="bottom-bar">
    <div class="check-content">
      <check-button
        class="check-button"
        :is-checked="isSelectAll"
        @click.native="checkClick">
      </check-button>
      <span>全选</span>
    </div>

    <div class="price">
      合计: {{ totalPrice }}
    </div>

    <div class="calculate" @click="calcClick">
      去计算({{ checkLength }})
    </div>
  </div>
</template>

<script>
import CheckButton from "@/components/content/checkButton/CheckButton";

import {mapGetters} from 'vuex'

export default {
  name: "CartBottomBar",
  components: {
    CheckButton,
  },
  computed: {
    ...mapGetters(['cartList']),
    totalPrice() {
      return '￥' + this.cartList.filter(item => {
        return item.checked
      }).reduce((preValue, item) => {
        return preValue + (item.price * item.count)
      }, 0).toFixed(2);
    },
    checkLength() {
      return this.cartList.filter(item => item.checked).length;
    },
    isSelectAll() {
      //当没有商品的时候，也被选中
      if (this.cartList.length === 0) return false

      //1.filter
      // return !(this.cartList.filter( item => !item.checked).length)

      //2.find
      return !this.cartList.find(item => !item.checked)
      //find()性能会更高

      //3.普通遍历
      // for (let item of this.cartList) {
      //   if (!item.checked) {
      //     return false
      //   }
      // }
      // return true

    }
  },
  methods: {
    checkClick() {
      if (this.isSelectAll) { //全部选中
        this.cartList.forEach(item => item.checked = false)
      } else {  //部分或全部不选中
        this.cartList.forEach(item => item.checked = true)
      }
    },
    calcClick() {
      if (!this.isSelectAll) {
        this.$toast.show('至少选择一件商品~',2000)
      }
    }
  },
}
</script>

<style scoped>
.bottom-bar {
  display: flex;
  position: relative;
  height: 40px;
  background-color: #eee;
  line-height: 40px;
  font-size: 14px;
}

.check-content {
  display: flex;
  align-items: center;
  margin-left: 10px;
  width: 60px;
}

.check-button {
  width: 20px;
  height: 20px;
  line-height: 20px;
  margin-right: 5px;
}

.price {
  margin-left: 30px;
  flex: 1;
}

.calculate {
  width: 90px;
  background-color: pink;
  color: #ffffff;
  text-align: center;
}
</style>
